Buggy code:
public class Parser { private void SystemGoal ( ) { } private void Program ( ) { } private void ProgramHeading ( ) { } private void Block ( ) { } private void VariableDeclarationPart ( ArrayList < Symbol > locals ) { } private void VariableDeclarationTail ( ArrayList < Symbol > locals ) { } private void VariableDeclaration ( ArrayList < Symbol > locals ) { stackTrace += "VariableDeclaration\n" ; switch ( getRule ( VariableDeclaration ) ) { case 9 : ArrayList < String > str = IdentifierList ( ) ; if ( ( l1 . getTerminal ( ) ) == ( Terminal . COLON ) ) { match ( ) ; } else { String [ ] err = new String [ ] { ":" } ; error ( err ) ; } Type type = Type ( ) ; for ( String s : str ) { sh . startEntry ( ) ; sh . setName ( s ) ; sh . setType ( type ) ; sh . setKind ( VARIABLE ) ; sh . finishEntry ( ) ; locals . add ( sh . getEntry ( s ) ) ; <START_BUG> sa . genStackPush ( ) ; <END_BUG> } break ; default : String [ ] err = new String [ ] { "identifier" } ; error ( err ) ; } } private Type Type ( ) { } private void ProcedureAndFunctionDeclarationPart ( ) { } private void ProcedureDeclaration ( ) { } private void FunctionDeclaration ( ) { } private Symbol ProcedureHeading ( ) { } private Symbol FunctionHeading ( ) { } private void OptionalFormalParameterList ( ) { } private void FormalParameterSectionTail ( ) { } private void FormalParameterSection ( ) { } private void ValueParameterSection ( ) { } private void VariableParameterSection ( ) { } private void StatementPart ( ) { } private void CompoundStatement ( ) { } private void StatementSequence ( ) { } private void StatementTail ( ) { } private void Statement ( ) { } private void EmptyStatement ( ) { } private void ReadStatement ( ) { } private void ReadParameterTail ( ) { } private void ReadParameter ( ) { } private void WriteStatement ( ) { } private void WriteParameterTail ( ) { } private void WriteParameter ( ) { } private void AssignmentStatement ( ) { } private void IfStatement ( ) { } private void OptionalElsePart ( ) { } private void RepeatStatement ( ) { } private void WhileStatement ( ) { } private void ForStatement ( ) { } private SemanticRecord ControlVariable ( ) { } private SemanticRecord InitialValue ( ) { } private boolean StepValue ( ) { } private SemanticRecord FinalValue ( ) { } private void ProcedureStatement ( ) { } private ArrayList < SemanticRecord > OptionalActualParameterList ( ) { } private void ActualParameterTail ( ArrayList < SemanticRecord > params ) { } private SemanticRecord ActualParameter ( ) { } private SemanticRecord Expression ( ) { } private SemanticRecord OptionalRelationalPart ( SemanticRecord left ) { } private Operator RelationalOperator ( ) { } private SemanticRecord SimpleExpression ( ) { } private SemanticRecord TermTail ( SemanticRecord left ) { } private boolean OptionalSign ( ) { } private Operator AddingOperator ( ) { } private SemanticRecord Term ( ) { } private SemanticRecord FactorTail ( SemanticRecord left ) { } private Operator MultiplyingOperator ( ) { } private SemanticRecord Factor ( ) { } private void ProgramIdentifier ( ) { } private String VariableIdentifier ( ) { } private String ProcedureIdentifier ( ) { } private String FunctionIdentifier ( ) { } private void BooleanExpression ( ) { } private SemanticRecord OrdinalExpression ( ) { } private ArrayList < String > IdentifierList ( ) { } private ArrayList < String > IdentifierTail ( ArrayList < String > str ) { } private final SymbolTableHandler sh ; private final SemanticAnalyzer sa ; private Token l1 ; private Token l2 ; private Scanner scanner ; private PrintWriter rFile ; private String rule_tree_file = "rule_list.csv" ; private boolean noerrors = true ; private int [ ] [ ] Table ; private String stackTrace = "" ; public Parser ( SemanticAnalyzer sa ) { } private String nextStr ( char [ ] arr ) { } private String removeStr ( char [ ] arr ) { } public boolean parseFile ( String in ) { } private int ruleFile ( int rule ) { } public void setRuleOutputFile ( String in ) { } private void match ( ) { } private void error ( String [ ] expected ) { } private int getRule ( NonTerminal nt ) { } }

Fix:
sa . padForVariable ( ) ;